private void checkMethodForWeakerAccessPrivileges(MethodNode mn, ClassNode cn) {
   Parameter[] params = mn.getParameters();
   for (MethodNode superMethod : cn.getSuperClass().getMethods(mn.getName())) {
     Parameter[] superParams = superMethod.getParameters();
     if (!hasEqualParameterTypes(params, superParams)) continue;
     if ((mn.isPrivate() && !superMethod.isPrivate())
         || (mn.isProtected() && superMethod.isPublic())) {
       addWeakerAccessError(cn, mn, params, superMethod);
       return;
     }
   }
 }
 private void checkInterfaceMethodVisibility(ClassNode node) {
   if (!node.isInterface()) return;
   for (MethodNode method : node.getMethods()) {
     if (method.isPrivate()) {
       addError(
           "Method '"
               + method.getName()
               + "' is private but should be public in "
               + getDescription(currentClass)
               + ".",
           method);
     } else if (method.isProtected()) {
       addError(
           "Method '"
               + method.getName()
               + "' is protected but should be public in "
               + getDescription(currentClass)
               + ".",
           method);
     }
   }
 }